Change the page title for the Stalwart admin portal

[halaklium]

I posted another, clearer message here and included a request to check the favicon.svg file, which currently appears to be corrupted.

Allow customizing the WebUI page title and restore/fix the Stalwart favicon/logo

Hello, I would like to suggest a small branding/customization improvement for the Stalwart WebUI. At the moment, the browser tab title of the WebUI appears to be hardcoded as: <title>Portal</title> After browsing the WebUI repository, it seems this is defined directly in the index.html file. It would be very useful to have a setting that allows administrators to customize this title, for example: Index.html <title>Stalwart Admin Console</title> or a custom value such as: <title>Mail Adm…